Which factor does NOT influence injury risk during an ejection?

The factor that does not influence injury risk during an ejection is random weather conditions. Ejection seats are designed with specific parameters in mind, and the conditions under which a pilot is ejected, including the airflow and environment they experience immediately after ejection, are influenced more by dynamic factors such as airspeed, boarding mass of the crew member, and equipment like helmets.

Weather conditions, while they can affect flight operations and safety overall, do not have a direct impact on the mechanics of the ejection process itself. The ejection system operates based on predefined physical principles such as acceleration forces and the mechanics of the ejection seat and restraint systems.

In contrast, factors like boarding mass influence how the forces of ejection are experienced by the crew member; higher mass can result in greater forces acting on the body. Airspeed at the moment of ejection can determine the trajectory and sequence of events after leaving the aircraft, thereby affecting the likelihood of injury during the ejection and subsequent descent. The type of helmet worn can also play a vital role in protecting the head during ejection, which inherently correlates with injury risk. Thus, random weather conditions stand apart as a factor that does not directly impact injury risk during an ejection.